It is pretty regularly pointed out in discussions of evolution, that if someone were to try and "intelligently design" lifeforms, they would be better off mixin

It is pretty regularly pointed out in discussions of evolution, that if someone were to try and "intelligently design" lifeforms, they would be better off mixing and matching components instead of trying to pile on with inheritance like you find in nature. (That's how you get a blind spot in the human eye, or the giraffe's crazy laryngeal nerve.)